Which of the Following Statements Is Correct

question 6

Multiple Choice

Which of the following statements is correct?

• A) The number of dummy variables that must be added to a regression model is one less than the number of categories for a qualitative independent variable.
• B) A dummy variable is incorporated into a regression model if the dependent variable is qualitative.
• C) Including a dummy variable into a regression model will simplify the regression results and help people to interpret the meaning of the regression parameters.
• D) The number of dummy variables that must be added to a regression model is one more than the number of categories for a qualitative independent variable.
• E) All of these.

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Definitions:

Gases Exchange

The process of oxygen and carbon dioxide moving between the bloodstream and the lungs in animals, and the atmosphere and cells in plants.

Diffusion

The process by which molecules spread from areas of high concentration to areas of low concentration, often leading to equilibrium.

Osmosis

The process by which molecules of a solvent pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.

Filtration

The process of separating solids from liquids or gases using a filter medium that allows only the fluid to pass through.